Graco Nautilus Owner's Manual page 67

When you remove the seat cover for
washing from the head support, there is foam
padding attached to the head support. This
foam pad MUST not be removed and is NOT
machine washable.
Foam pad may ONLY be wiped clean with a
damp cloth.
Always make sure the elastic straps of the
foam padding are securely attached to hooks
on the back of the head support as shown.
NEVER use the carseat if the foam pad is
not attached to the head support exactly as
shown.
Front view of head support without seat cover

Rear view of head support without seat cover
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67
Foam padding
Elastic straps
that are
attached to the
foam padding